• Wishlists
  • 877-477-7823
  • Contact Us
Thumbs 1
Thumbs 1


From $29.75 to $34.55
Description Part Number Price Buy
Fuel Warning Sensor 6905-400 $34.55
Fuel Warning Light 05-17660 $29.75
Subtotal $0.00
Add to Wishlist


Float-action sensor in tank activates panel warning light when fuel supply is low. All-PBT unit, impervious to aviation fuel. Use AN 867-4 flange for mounting.

Note: Bulb not included. See "Accessories" to order bulb.

DISCOUNTS: 10% ON 6, 15% ON 12, 20% ON 50


Installed one of these on an ultralight and I love it. Building another plane and will install one of these as a standalone backup to the main fuel gauge. Very good piece of equipment. Good value.

Phill S
January 1, 2019


Q: Can this unit be mounted vertically on the top of the tank?

Per the supplier: "No, the M7700 (part # 6905-400) is a side mounted level switch. The vertical mount comparable to this is our M7000." The M7000 is currently special order only. Please contact sales for pricing, lead time, and ordering information.

Q: When installed with AN 867-4 flange as recommended, is a thread seal compound recommended, and if so, which one?

Per the supplier: Yes, you should use a thread seal compound on the M7700, but we cannot recommend one. You will need to select one that will work in your application and be compatible with the fluid and the M7700.

Q: Can this switch be used with non-ethanol auto fuel?

Per Vendor, Yes it will work with auto fuel.

Q: Can this Fuel Warning System be installed in an ultralight? I have two tanks of 20 liters side by side and interconnected. How would I do the installation? Is there a manual?

Yes, the fuel warning system can be installed in an ultralight aircraft. A detailed manual is included for installation procedures.

Q: What is the thread size that fits into the tank on this fuel warning system?

The threaded section is 1/2" NPT.

Q: What is the weight of the sensor for this fuel warning system? What are the measurements?

The weight of the sensor is .09 lbs. The dimensions of this unit is 4.3" in length and 1.13" width of the nut part attaching end. This is the widest/tallest part of the unit. This unit has a 1/2" NPT threads.

Q: Does this switch, part # 6905-400, need to be installed from inside the tank or can it be installed from the outside if there is no internal access?

Yes, 6905-400 can be installed from the outside of the tank. You will just need to make sure the float can fit through the hole.

Q: Is it TSOd ? Can I install it in a certified aircraft ?

No. This unit only does not have an FAA approval.

View in Catalog

View Image View in Catalog